Lathe turning and boring attachment



March 15, 1932. P. VETTER 1,849,512.

LATHE TURNING AND BORING ATTACHMENT Filed Jan. 25, 1930 2 Sheets-Sheet 1 g 26 a 27 2.9 54 25 2/ /6. 1/;0 /5 um Xnjfl March 15, 1932. P. VETTER LATHE TURNING AND BORING ATTACHMENT Filed Jan. 25, 1930 2 Sheets-S heet" 2 6 v IINIQ/IIENTOR.

Patented Mar. 15, 1932 PHILIP? VETTER, OF OAKLAND, CALIFORNIA LATHE TURNING AND BORING ATTACHMENT Application filed January 25, 1930. Serial No. 423,373.

The invention is for a turning and boring attachment for producing irregular shapes.

The objects of the invention are First: To provide an attachment for lathes whereby regular shapes may be turned or bored as readily as ordinary circular sections. Second: To provide an attachment for lathes whereby oval, rounded triangular, rounded square and similar shapes may be produced either straight or taper, and corresponding holes bored for reception of such shapes.

Third: To provide an attachment for lathes whereby parts may be turned and holes bored to fit such parts, of elliptic, triangular square and similar shapes whereby no means of keying such parts will be required, and whereby the same attachment may be used for circular turning and boring, and, taper turning and boring either circular or regular shapes. r

Fourth: To provide an attachment for lathes for turning and boring of both circu- M lar and other than circular shapes, and J adapted for cooperationwith a taper turningattachment for turning and boring such shapes to definite tapers, when desired.

Fifth To provide a device as described which is adjustable for various diameters and shapes.

Referring to the accompanying drawings: Fig. 1 is a plan view of an ordinary back geared engine lathe, equipped with a taper turning attachment all shown in light lines, and my invention applied thereto and shown in heavy lines; V

Fig. 2 is a longitudinal vertical section taken on line 22 of Fig. 5;

Fig. 3 is a sectional View taken through the eccentric adjusting mechanism on an enlarged scale; i

Fig. 4 indicates several shapes which may be turned and bored by means of my device;

Fig. 5 is a plan view of the invention;

Fig. 6 is a longitudinal elevationof theinvention;

Fig. 7 is a transverse sectional taken on line 7-7 of F ig. 5.

Similar reference characters are used for 03 similar parts throughout the several views.

elevation of the invention.

The invention is indicated as mounted on an ordinaryback geared engine lathe, Fig. 1, provided with the customary ways 1, tail stock 2, spindle 3, spindle gear 4, cone pulleys 5, feed rod 6, change gears 7, apron 8, 5 saddle 9, and is also shown equipped with a standard taper turning attachment 10,

which is only used when the parts are to be turned or bored to a taper. The invention is indicated in heavy lines and is mounted on the saddle 9 in place of the ordinary compound rest. The device is applicable to other types of lathes, and is merely indicated in connection with the ordinary engine lathe as it is the most generally known and used type. V V The parts so far indicated are not a part The invention consists of a base 11 adapted to fit the cross slider 12 in place of the ordinary compound rest or may be fitted to the saddle ways 12. A housing 13, integral'with base 11, provides bearings for shafts 14 and 15, and protection for a series of change gears therein. Ways 16 are provided for guiding L5 the reciprocating member 17. A slot 18 is provided for the transverse feed nut stud 19 and a similar slot 20 is provided for the taper turning attachment clamp bolt'21,,when the device is to be adapted to fit the saddleways 30 '12. A cover 22, attached to the housing by means of screws 23 protects the change gears from chips and dirt and also provides a support and bearing for the gear shifter and co-' operating parts. I

The reciprocating member or rest comprises a housing 17 adapted to slide on the gibway 16 and provided with an adjustable gib 24. A T slot 25 is provided for the tool post 26 of standard construction and having '90 a tool bit 27 retained therein in adjusted position by the screw 28. A washer 29 provides a seat for tool bit 27. A clamp bolt 30 passes through a slot 31 and cooperates with a threaded aperture 32' in base 11, for clamping the reciprocating member to the base 11.

An adjustable thrust block 33 slidably fitted in housing 17, and between the housing. and top of gibway 16, is provided with a recess 34'to straddle clamp bolt 30, as also an I A projection 37 necting shaft 53.

either gear 57 with gear 46, or,

aperture 35 to receive connecting rod pin 36. provided with a bolt end 38 and integral with thrust block 33 has a threaded aperture 39 therein for coperation with the adjusting screw 40.

The adjusting screw 40 is provided with a threaded portion cooperating with the threaded aperture 39 and is free to rotate in the reciprocating member 16 at 41 and in the thrust cap 42, the thrust collar 43 being retained between housing 17 and thrust cap 42, which in turn is attached by bolts 43 to housing 17. A knurled knob 44 is provided for convenient adjustment and may be provided with micrometric graduations for convenience of adjustment. 8

The driving mechanism comprises a plurality of paired gears, and as indicated in the drawings two differentratios and neutral are obtainable. Gears 45 and 46 are fixedly related to shaft 15 and gears 47 and 48 are slidably but not rotatably related to shaft 14, a feather key 49 preventing rotation of these gears on shaft 14. Gears 45 ans 46 are spaced a sufficient distance apart to clear both gears 47 and 48. Shaft 14 is connected to a sliding shaft 50 which is slidably, but not rotatably disposed in the drive gear 51, by means of universal joints 52 and con- Bearings 54 are disposed on either side of gear 51, shaft 50 being rotatably and slidably mounted therein.

A gear shifter, comprising the arm 55 with depending pins 56 for engagement of the opposite faces of gear 48, and pivotally mounted in cover 22 at 57, has shifter lever 58 fixed thereto. Gears 47 and 48 are attach-ed to each other and adapted to be shifted to neutral osition as indicated in Fig. 5, or may be shifted'to either side causing engagement of gear 48 with gear 45, providing two different ratios. Any known method of changing ratios may be used, and any desired number of ratios provided for. An'additional ratio could be provided by attaching the universal joint to shaft 15 which would then provide three different ratios, one ratio when driven direct through shaft 15, and two additional ratios when driven through shaft 14. The inner end of shaft 15 is provided with an eccentric 59, which is provided with an aperture 60 to receive an adjusting pinion 61 and so disposed as to cooperate with mating teeth 62 formed about the inner surface of a coasting eccentric ring 63 rotatably fitted on the eccentric 59. Indicating marks 64 are provided to indicate the adjustment and relative throw of the compound eccentric 59 and 63.-

The adjusting device comprises a pinion 61 having teeth 65 cut in the periphery there of and provided with a collar 66 cooperating with a cou-nterbore 67 in eccentric 59 and a recess 69 in eccentric 63. A washer 70 is adapted to straddle the aperture 60 and ring 63, and has an aperture 71 for reception of stud end 7 2 on pinion 61, stud end 72 being provided with threads to cooperate with clamp nut 7 3, and has the end thereof formed as at 74 for cooperation with a wrench to be used for adjusting the twoeccentrics relative to one another. he eccentric strap 75 is provided with a bore 7 6 to rotatably fit eccentric 63, and is provided with means of adjustment 77 to prevent play between the eccentric 63 and eccentric strap 7 5, and is indicated as a. split bearing with draw-up bolt for taking up wear between the eccentric 63 and eccentric strap 75.

Pinion 61 acts in the capacity of a key between the two eccentrics when nut 73 is tightened. An aperture is provided at the opposite end of eccentric strap 7 5 to receive the connection pin 36 cooperating with thrust block 33.

The installation of the device is as follows: The device may be mounted in place of the ordinary compound rest, as indicated in 1, or may be adapted to fit the saddle ways as indicated in Figs. 2, 6 and 7. Bearings 54 are attached to some convenient stationary part of the lathe and so disposed as to cause gear 51 to mesh with some constant driven gear of the lathe, and is indicated in Fig. 1 as driven by the main spindle gear 4 which revolves with spindle 3 in unitary ratio. Gear 51 may be driven by any of the lathe gears which are not idle while the spindle is being driven, as the operation of the device is dependent on a definite ratio between spindle 3 and eccentric 59. The invention may be adapted for mounting on the cross slide, as indicated in r Fig. 1 at 12, in which case the invention could be swiveled similar to the standard compound rest, or it may be mounted as indicated in Figs. 2-6 and 7, directly on the saddle ways 12, in which case the device could not be swiveled.

The operation of the device for straight turning to the elliptical shape indicated in F 4 a is as follows: It will be assumed that the ratios of the various gear combinations are as follows: Spindle gear 4 to driven gear 51 is 1 to 3; gears 47 and 46, ration 2 to 3; and gears 48 and 45', ratio 4 to 3. Shaft 50 would then make three revolutions to each revolution of spindle 3. For producing the elliptical form it is necessary that eccentric shaft 15 make two revolutions to each revolution of spindle 3 as the elliptical form has two flattened sides. Therefore by shifting lever 58 to the left, gear 47 is brought into mesh with gear 46, and as the ratio is 2 to 3 between these gears, and 1 to 3 between gears 4 and 51, a ratio of 2 to- 1 is obtained between eccentric shaft 15 and spindle 3; that is, the eccentric 59 will make two revolutions for each revolution of spindle 3. Clamp nut 73 is loosened, and the pinion 63 turned by means of a wrenchin cooperation with the head 74, adjusting thereby the two eccentrics 59 and 63 relative to each other until the re quired stroke is indicated by the index marks 64 on eccentric 63, the required stroke being one half the difference between the major diameter D and minor diameter (Z. Nut 73 is then drawn up tight, thereby locking the two eccentrics in adjusted position. A properly formed tool bit 27 is inserted in tool holder 26 and clamped by means of the customary screw 28. The cross feed nut 78 is clamped to the base member 11 where the cross slide is not used for the purpose of adjusting the tool 27 to the work. Clamp screw 38 is tightened, clamping thrust block 33 to reciprocating member 17. Screw is released to permit housing 17 to reciprocate on base 11. The work 79 is placed between the head and tail centers, and held by the dog 80, or chucked, in any convenient manner. Power is applied to the lathe, and the tool 27 advanced to the work by means of the cross slidecrank 81 cooperating with the cross feed screw 82. Feed rod 6 provides for longitudinal travel of the apron 8, and coincidently therewith, the tool bit 27 and cooperating parts. The work 7 9 is revolved with spindle 3 and gear 4, the gear 4 driving gear 51 and rotating shaft which is slidable in and driven by gear 51. Shaft 50 is provided with a double universal joint, as indicated, to permit axial displacement of shaft 14 relative to shaft 50, and drives shaft 14 through said universal joints. Shaft 14 with gear 47 in mesh with gear 46 drives the shaft 15 and the compound eccentric 59 and 63 at a speed twice that of spindle 3 and work 79. A reciprocating motion is applied to the housing 17 through thrust block 33, the motion being imparted to the tool bit 27, so that for each revolution of the work 79, the tool bit advances and retreats twice, the advancing movements cutting from major diameter D to minor diameter (Z and the retreating movements cutting from minor diameter (Z to major diameter D. The tool is gradually advanced toward the head stock by feed rod 6 cooperating with standard mechanism in the apron 8. As described, a shape similar to Fig. 4, A would be produced with no variation in the major or minor diameters D and (5 throughout the length of the part. After turning the elliptical or other shape, should it be desired to continue with the rounded triangular shape indicated in Fig. 4. b, the only change requiredwould be to change connecting shaft 53 from shaft 14 to shaft 15, providing a direct ratio of 1 to 3 from spindle 3 to eccentric shaft 15. Should different diameters be required, the eccentrics are adjusted as desired by means of pinion 61 and the tool bit 27 advanced to the work. As the tool bit would then be caused to advance and retreat three times for each revthrough which bolts 90 olution of the spindle, three flatted sides would be formed by this arrangement. Should it be desired to continue turning to a circular form, with shaft 53 attached to shaft 14, as originally described, it would be necessary to move lever 58 to neutral position as indicated in Fig. 5, tighten screw or bolt 30, clamping housing 17 to base 11, and thereby prevent any reciprocating motion of the tool bit 27.

For boring the shapes as described, no changes would be required except turning the drive gear 45 and coincidently therewith shaft 15, the ratio between gears 48 and 45 being as 4 to 3. Any arrangement of gearing may be provided which will provide the proper ratio between spindle 3 and eccentric shaft 15. v; i

The method of producing tapered irregular forms as indicated at 82 will now be described. A taper attachment p'rocurable from various manufacturers of lathes and similar mechanical equipment is indicated at 10 as an entirety and comprises an arm 83 having a slide 84 pivotally mounted thereon and adjustable about the pivot by means of an adjusting screw 85. The arm 83 is supported by and slidably mounted on a bracket 86 attached to the carriage or saddle 9. A clamp '87 at one end of arm 83 is attachable to the lathe bed when turning tapers. A shoe 88 is slidably mounted on the slide 84. Slide '84 is provided with arcuate slots 89, pass for clamping slide 84 to arm 83 in adjusted position. At the end of slide 84 index marks 91 are provided, which'in cooperation with a pointer 92 fixedly related to arm 83, indicates the taper for which the attachment is adjusted,

or in inches per foot customarily in degrees or both. The draw bar 93 is pivotally mounted at 94 on the shoe 88 and iscustomarily clamped at its opposite end to the tool slide, and, in the drawings, to the base 11 which is indicated as replacing thetool slide. Should the device be made so as to be mounted on the cross slide in place of the compound rest, then the draw bar would be attached to the cross slide. The bolt 21 is provided for attachment thereto and for straight turning would not be clamped or tightened, while for taper turning, bar 93 would be fixedly clamped to the cross slide or base 11. After adjusting slide 84 to the desired taper and clamping bar 93 to slide'll by means of bolt 21 and releasing .lathe' and adapted. for

nut-78- from cooperation with base 11, the device is ready for. turning or boring" the aforementioned shapes tothe desired taper.

It will. be understood that the drawings provide only an illustrative embodiment of my invention, and that variations in the design, construction and arrangement of parts may be resorted to without departing from the spirit or scope of the invention. or sacrificing any of the advantages thereof.

I claim 1, In combination, a base adapted for attachment to the cross slide or slideways of a cooperation with a taper turning attachment, a. tool holding member slidably mounted on said. base and provided with. an adjustable thrust block,

'means for adjusting said thrust block relative to said tool holding. member, means for reciprocating said thrust block and coincidently therewith said tool. holding member, said means comprising a connecting rod one end of which is pivotally mounted in said thrust block, the opposite end thereof cooperating with an adjustable stroke eccentric, a shaft on said eccentric, driving means for said shaft and revolving said shaft at speeds that are integral multiples of the lathe spindle speed,means for releasing said driving means and fixedly clamping said tool holding member to said base, and means whereby said device may be caused to cooperate with the cross feed screw or cross slide of. said lathe.

2. A lathe attachment, in combination, a basetransversely adjustable by means of a cross-feed screw and releasing means therefor, said base having means for attachment to the draw bar of a taper turning attachment, a tool rest having a T slot for reception of a tool post and slidably mounted on said base, means for immovably clamping said rest to saidbase, a thrust block adj'ustarb-ly secured in said'rest said thrust block cooperating with a reciprocating member, a reciprocating member cooperating with actuating mechanism mounted in bearings integral with said base, driving means" for said actuating mechanism, and means for disengaging said driving means from said actuating mechanism.

3-. A lathe attachment, in combination, a base slidably mounted on or a gibway, a feed nut releasably mounted at one end thereof adapted to cooperate with a cross-feed screw,

an aligning recess adapted to receive the draw bar of a taper turning attachment, means for securing said draw bar to said base, a tool rest slidably mounted onsaid base, a T slot in said rest adapted to; receive a tool post, a belt for clamp-ing said rest to said base, means for reciprocating said rest, said means being supported in bearings integral with said base, driving means for said reciprocating means, and means for disengaging said driving means from said reciprocating means.

4:. A lathe attachment, in combination, a base slidably mounted on or in a gibway, a feed nut releasably mounted at one end thereof. adapted to cooperate with a cross-feed screw, a draw bar receiving recess formed in the undersurface of said base, means for securing said draw bar to said base and within said recess, said draw bar cooperating with a taper turning, attachment, a tool rest slidably mounted on said base, a clamp bolt passing through said rest and cooperating with said base for immovably securing said rest to said base, a thrust block adjustably secured in said rest, a connecting rod cooperating with said thrust block, said connecting rod being mounted on an adjustable stroke eccentric, an adjustable stroke eccentric mounted in bearings integral with said base and detachable driving means for said eccentric.

5. A lathe attachment, in combination, a base slidably mounted relative to the saddle of a lathe, a detachable feed nut adjacent one end adapted to'cooperate with a cross-feed screw, a drawbar receiving recess formed in the undersurface of said base, securing means for said drawbar, said drawbar comprising a part of a taper turning attachment, a tool rest slidably secured on said base, means for immovably securing said tool rest to said base, a thrust member adjustably secured to said rest, an adjustable eccentric, a connectrod cooperating with said eccentric and said thrust member, a shaft for said eccentric and rotatably mounted in bearings integral with said base, driving means for said shaft, and means for disengaging said driving means.

6. A lathe attachment, comprising a base slidably mounted relative to the saddle of a lathe, a detachable feed nut mounted at one end of said base and adapted to cooperate with a cross feed screw, a drawbar receiving recess formed in the undersurface of said base adapted ,to fixedly receive the drawbar of a taper turningattachment, means for securing said drawbar in said recess, a tool rest slidably secured on said base, means for fixedly securing said rest to said base, means for reciprocating said rest, said means being mounted in bearings integral with said base and disengageable driving means for said reciprocating means.

7. A lathe attachment comprising a base slidably secured relative to the saddle of a lathe, and adapted to transverse feed relative to the lathe spindle by either, a cross feed screw or a taper turning attachment, a tool rest slidably secured to said base, means for clamping said tool rest to said base, an adjustable throw eccentric, a shaft for said eccentric, bearings integral with said base for said shaft, a thrust member adjustably secured in said rest, a connecting rod cooperating with said thrust member and said eccentric, and disengageable driving means for said shaft.

8- A lathe attachment comprising a base slidably secured relative to the saddle of a lathe and adapted to cooperate selectively with a cross-feed screw and a taper turning attachment, a tool rest reciprocatably mounted on said base, means for fixedly clamping said tool rest to said base, adjustable stroke reciprocating means for said tool rest, said reciprocating means being mounted in 10 tegrally with said base, means for adjusting said rest relative to said reciprocating means, driving means for said reciprocating means and disengaging means for said driving means.

9. A lathe attachment comprising a base slidably secured relative to the saddle of a lathe and adapted to cooperate selectively with a cross-feed screw and a taper turning attachment, a tool rest reciprocatably mounted on said base, means for fixedly clamping said tool rest to said base, an adj ustable stroke eccentric, a shaft for said eccentric, bearings integral with said base for said shaft, a thrust block adjustably secured in said tool rest, a

connecting rod cooperating with said thrust block and said eccentric, a change gear housing integral with said base, change gears in said housing cooperating with said shaft and a drive shaft, means for selectively engaging and disengaging said gears, and means for selectively driving said shafts.

In testimony whereof I have aflixed my signature.

PHILIPP VETTER. 

